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DIY instructions for making your own pint-glass spar platform.


  • See that a free-floating spar platform can be stable.
  • You can make waves in the glass and show the wave response.
  • Fun!

Suggested materials

  • Spar: a straw
  • Ballast: some lead shot (or pebbles?). Weight?
  • Platform: a beer coaster.
  • Website selling easy malleable plastics.


  • Clip/staple the bottom of the straw closed.
  • Pour in ballast.
  •  ? Good way to connect coaster
  • Add load/decoration to platform (plastic figures?)

Structure Designs
Structure requirements · PintStead · Spar · Semi-submersible · Submersible · Boats · Collaborative Design · Space Frame · Low Cost Seastead · Conex dumbbell ·
Materials · Thin Shell Ferrocement Concrete
Engineering Data
Low Cost Wave Tank · Scale models · Software
Stability & Propulsion
Stability · Propulsion · Gyroscopes · Stabilizers · Pneumatically Stabilized Platforms ·